The Seagate FreeAgent GoFlex 1.5TB portable drive isn't the first of the company's modular external storage we've reviewed, but it's certainly the largest. Proudly billed as the industry's first 1.5TB portable external drive, the new FreeAgent also boasts a speedy USB 3.0 interface for faster data shuffling. Thanks to GoFlex, meanwhile, you can also switch that out for FireWire, eSATA or other connections, or even slap it in one of Seagate's docking stations. Is this the best portable drive out there? Check out our full review after the cut.